<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>blurpicker.cpp 示例文件 | Qt Widgets 5.12.3</title>
  <link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
  <script type="text/javascript">
    document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
    // loading style sheet breaks anchors that were jumped to before
    // so force jumping to anchor again
    setTimeout(function() {
        var anchor = location.hash;
        // need to jump to different anchor first (e.g. none)
        location.hash = "#";
        setTimeout(function() {
            location.hash = anchor;
        }, 0);
    }, 0);
  </script>
</head>
<body>
<div class="header" id="qtdocheader">
  <div class="main">
    <div class="main-rounded">
      <div class="navigationbar">
        <table><tr>
<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-effects-blurpicker-example.html">Blur Picker Effect Example</a></td><td >blurpicker.cpp 示例文件</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.3 参考指南</a></td>
        </tr></table>
      </div>
    </div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">blurpicker.cpp 示例文件</h1>
<span class="subtitle">effects/blurpicker/blurpicker.cpp</span>
<!-- $$$effects/blurpicker/blurpicker.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;blurpicker.h&quot;</span>

  <span class="preprocessor">#include &lt;QtWidgets&gt;</span>
  <span class="preprocessor">#include &lt;QtCore/qmath.h&gt;</span>
  <span class="preprocessor">#include &lt;qmath.h&gt;</span>
  <span class="preprocessor">#include &quot;blureffect.h&quot;</span>

  BlurPicker<span class="operator">::</span>BlurPicker(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent): <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span>(parent)<span class="operator">,</span> m_index(<span class="number">0.0</span>)<span class="operator">,</span> m_animation(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;index&quot;</span>)
  {
      setBackgroundBrush(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/images/background.jpg&quot;</span>));
      setScene(<span class="keyword">new</span> <span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span>(<span class="keyword">this</span>));

      setupScene();
      setIndex(<span class="number">0</span>);

      m_animation<span class="operator">.</span>setDuration(<span class="number">400</span>);
      m_animation<span class="operator">.</span>setEasingCurve(<span class="type"><a href="../qtcore/qeasingcurve.html">QEasingCurve</a></span><span class="operator">::</span>InOutSine);

      setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">true</span>);
      setFrameStyle(<span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>NoFrame);
  }

  <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> BlurPicker<span class="operator">::</span>index() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_index;
  }

  <span class="type">void</span> BlurPicker<span class="operator">::</span>setIndex(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> index)
  {
      m_index <span class="operator">=</span> index;

      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> baseline <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> iconAngle <span class="operator">=</span> <span class="number">2</span> <span class="operator">*</span> M_PI <span class="operator">/</span> m_icons<span class="operator">.</span>count();
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> m_icons<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
          <span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>icon <span class="operator">=</span> m_icons<span class="operator">[</span>i<span class="operator">]</span>;
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> a <span class="operator">=</span> (i <span class="operator">+</span> m_index) <span class="operator">*</span> iconAngle;
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> xs <span class="operator">=</span> <span class="number">170</span> <span class="operator">*</span> <a href="../qtcore/qtmath.html#qSin">qSin</a>(a);
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> ys <span class="operator">=</span> <span class="number">100</span> <span class="operator">*</span> <a href="../qtcore/qtmath.html#qCos">qCos</a>(a);
          <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> pos(xs<span class="operator">,</span> ys);
          pos <span class="operator">=</span> <span class="type"><a href="../qtgui/qtransform.html">QTransform</a></span>()<span class="operator">.</span>rotate(<span class="operator">-</span><span class="number">20</span>)<span class="operator">.</span>map(pos);
          pos <span class="operator">-</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">40</span><span class="operator">,</span> <span class="number">40</span>);
          icon<span class="operator">-</span><span class="operator">&gt;</span>setPos(pos);
          baseline <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(baseline<span class="operator">,</span> ys);
          <span class="keyword">static_cast</span><span class="operator">&lt;</span>BlurEffect <span class="operator">*</span><span class="operator">&gt;</span>(icon<span class="operator">-</span><span class="operator">&gt;</span>graphicsEffect())<span class="operator">-</span><span class="operator">&gt;</span>setBaseLine(baseline);
      }

      scene()<span class="operator">-</span><span class="operator">&gt;</span>update();
  }

  <span class="type">void</span> BlurPicker<span class="operator">::</span>setupScene()
  {
      scene()<span class="operator">-</span><span class="operator">&gt;</span>setSceneRect(<span class="operator">-</span><span class="number">200</span><span class="operator">,</span> <span class="operator">-</span><span class="number">120</span><span class="operator">,</span> <span class="number">400</span><span class="operator">,</span> <span class="number">240</span>);

      <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> names;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/accessories-calculator.png&quot;</span>;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/accessories-text-editor.png&quot;</span>;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/help-browser.png&quot;</span>;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/internet-group-chat.png&quot;</span>;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/internet-mail.png&quot;</span>;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/internet-web-browser.png&quot;</span>;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/office-calendar.png&quot;</span>;
      names <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;:/images/system-users.png&quot;</span>;

      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> names<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>) {
          <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap(names<span class="operator">[</span>i<span class="operator">]</span>);
          <span class="type"><a href="qgraphicspixmapitem.html">QGraphicsPixmapItem</a></span> <span class="operator">*</span>icon <span class="operator">=</span> scene()<span class="operator">-</span><span class="operator">&gt;</span>addPixmap(pixmap);
          icon<span class="operator">-</span><span class="operator">&gt;</span>setZValue(<span class="number">1</span>);
          icon<span class="operator">-</span><span class="operator">&gt;</span>setGraphicsEffect(<span class="keyword">new</span> BlurEffect(icon));
          m_icons <span class="operator">&lt;</span><span class="operator">&lt;</span> icon;
      }

      <span class="type"><a href="qgraphicspixmapitem.html">QGraphicsPixmapItem</a></span> <span class="operator">*</span>bg <span class="operator">=</span> scene()<span class="operator">-</span><span class="operator">&gt;</span>addPixmap(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/images/background.jpg&quot;</span>));
      bg<span class="operator">-</span><span class="operator">&gt;</span>setZValue(<span class="number">0</span>);
      bg<span class="operator">-</span><span class="operator">&gt;</span>setPos(<span class="operator">-</span><span class="number">200</span><span class="operator">,</span> <span class="operator">-</span><span class="number">150</span>);
  }

  <span class="type">void</span> BlurPicker<span class="operator">::</span>keyPressEvent(<span class="type"><a href="../qtgui/qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type">int</span> delta <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">&gt;</span>key())
      {
      <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Left:
          delta <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
          <span class="keyword">break</span>;
      <span class="keyword">case</span>  <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Right:
          delta <span class="operator">=</span> <span class="number">1</span>;
          <span class="keyword">break</span>;
      <span class="keyword">default</span>:
          <span class="keyword">break</span>;
      }
      <span class="keyword">if</span> (m_animation<span class="operator">.</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qabstractanimation.html">QAbstractAnimation</a></span><span class="operator">::</span>Stopped <span class="operator">&amp;</span><span class="operator">&amp;</span> delta) {
          m_animation<span class="operator">.</span>setEndValue(m_index <span class="operator">+</span> delta);
          m_animation<span class="operator">.</span>start();
          event<span class="operator">-</span><span class="operator">&gt;</span>accept();
      }
  }

  <span class="type">void</span> BlurPicker<span class="operator">::</span>resizeEvent(<span class="type"><a href="../qtgui/qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span> <span class="comment">/* event */</span>)
  {
  }

  <span class="type">void</span> BlurPicker<span class="operator">::</span>mousePressEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type">int</span> delta <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">if</span>(event<span class="operator">-</span><span class="operator">&gt;</span>x() <span class="operator">&gt;</span> (width() <span class="operator">/</span> <span class="number">2</span>))
      {
          delta <span class="operator">=</span> <span class="number">1</span>;
      }
      <span class="keyword">else</span>
      {
          delta <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
      }

      <span class="keyword">if</span> (m_animation<span class="operator">.</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qabstractanimation.html">QAbstractAnimation</a></span><span class="operator">::</span>Stopped <span class="operator">&amp;</span><span class="operator">&amp;</span> delta) {
          m_animation<span class="operator">.</span>setEndValue(m_index <span class="operator">+</span> delta);
          m_animation<span class="operator">.</span>start();
          event<span class="operator">-</span><span class="operator">&gt;</span>accept();
      }
  }

</pre>
</div>
<!-- @@@effects/blurpicker/blurpicker.cpp -->
        </div>
       </div>
   </div>
   </div>
</div>
<div class="footer">
   <p>
   <acronym title="Copyright">&copy;</acronym> 2019 The Qt Company Ltd.
   Documentation contributions included herein are the copyrights of
   their respective owners.<br/>    The documentation provided herein is licensed under the terms of the    <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation    License version 1.3</a> as published by the Free Software Foundation.<br/>    Qt and respective logos are trademarks of The Qt Company Ltd.     in Finland and/or other countries worldwide. All other trademarks are property
   of their respective owners. </p>
</div>
</body>
</html>
